我在我的一项活动中遇到匹配Toast消息的问题。在其他情况下，它的工作没有任何问题，但在这个特定的一个，它没有。我不知道任何可能导致此行为的特殊布局更改。
我得到以下异常：
java.lang.RuntimeException: Waited for the root of the view hierarchy to have window focus and not be requesting layout for over 10 seconds. If you specified a non default root matcher, it may be picking a root that never takes focus. Otherwise, something is seriously wrong. Selected Root:
Root{application-window-token=android.view.ViewRootImpl$W@40dcb2, window-token=android.view.ViewRootImpl$W@40dcb2, has-window-focus=false, layout-params-type=2, layout-params-string=WM.LayoutParams{(0,0)(wrapxwrap) gr=#11 sim=#20 ty=2 fl=#1820002 pfl=0x8 fmt=-3 wanim=0x7f0a0088 surfaceInsets=Rect(0, 0 - 0, 0) mwfl=0x10}, decor-view-string=DecorView{id=-1, visibility=GONE, width=1002, height=348, has-focus=false, has-focusable=false, has-window-focus=false, is-clickable=false, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, root-is-layout-requested=false, has-input-connection=false, x=0.0, y=0.0, child-count=1}}
. All Roots:
Root{application-window-token=android.view.ViewRootImpl$W@19481ebd, window-token=android.view.ViewRootImpl$W@19481ebd, has-window-focus=true, layout-params-type=1, layout-params-string=WM.LayoutParams{(0,0)(fillxfill) sim=#2 ty=1 fl=#81810500 pfl=0x8 wanim=0x1030461 surfaceInsets=Rect(0, 0 - 0, 0) mwfl=0x10}, decor-view-string=DecorView{id=-1, visibility=VISIBLE, width=1080, height=1920, has-focus=true, has-focusable=true, has-window-focus=true, is-clickable=false, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, root-is-layout-requested=false, has-input-connection=false, x=0.0, y=0.0, child-count=1}}
Root{application-window-token=android.view.ViewRootImpl$W@40dcb2, window-token=android.view.ViewRootImpl$W@40dcb2, has-window-focus=false, layout-params-type=2, layout-params-string=WM.LayoutParams{(0,0)(wrapxwrap) gr=#11 sim=#20 ty=2 fl=#1820002 pfl=0x8 fmt=-3 wanim=0x7f0a0088 surfaceInsets=Rect(0, 0 - 0, 0) mwfl=0x10}, decor-view-string=DecorView{id=-1, visibility=GONE, width=1002, height=348, has-focus=false, has-focusable=false, has-window-focus=false, is-clickable=false, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, root-is-layout-requested=false, has-input-connection=false, x=0.0, y=0.0, child-count=1}}
at android.support.test.espresso.base.RootViewPicker.get(RootViewPicker.java:99)
at android.support.test.espresso.ViewInteractionModule.provideRootView(ViewInteractionModule.java:69)
at android.support.test.espresso.ViewInteractionModule_ProvideRootViewFactory.get(ViewInteractionModule_ProvideRootViewFactory.java:23)
at android.support.test.espresso.ViewInteractionModule_ProvideRootViewFactory.get(ViewInteractionModule_ProvideRootViewFactory.java:9)
at android.support.test.espresso.base.ViewFinderImpl.getView(ViewFinderImpl.java:68)
at android.support.test.espresso.ViewInteraction$2.run(ViewInteraction.java:166)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5951)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
我正在检查toast消息如下（ NOT 工作）：
onView(withText(R.string.act_preferences_context_empty))
.inRoot(withDecorView(not(is(mActivityRule.getActivity().getWindow().getDecorView()))))
.check(matches(isDisplayed()));
然而，当我像这样检查吐司时，它有效：
onView(withText(R.string.act_preferences_context_empty))
.inRoot(not(isFocusable()))
.check(matches(isDisplayed()));
有人可以解释这种行为吗？感谢。